Strong D* → Dπ and B* → Bπ couplings

• Autor(a) principal: El-Bennich, Bruno [UNESP]
• Data de Publicação: 2011
• Outros Autores: Ivanov, Mikhail A., Roberts, Craig D.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevC.83.025205; http://hdl.handle.net/11449/226261

We compute gD*Dπ and gB*Bπ using a framework in which all elements are constrained by Dyson-Schwinger equation studies of QCD and therefore incorporates a consistent, direct, and simultaneous description of light and heavy quarks and the states they may constitute. We link these couplings with the heavy-light-meson leptonic decay constants and thereby obtain gD*Dπ=15.9-1.0+2.1 and g B*Bπ=30.0-1.4+3.2. From the latter, we infer ǧB=0.37-0.02+0.04. A comparison between g D*Dπ and gB*Bπ indicates that when the c quark is a system's heaviest constituent, ΛQCD/m c-corrections are not under good control. © 2011 American Physical Society.